NICE, STURDY, and DURABLE propellers I've also tried the ... APC style propeller 7x6-E PRODUCT ID: APC7x6-E ... but these 7x5 propellers seem more durable and of a less stiffer plastic. Also the shaft hole is larger so there's no extra reaming or drilling out the hole any larger. GOOD PRODUCT and once again Hobby King comes through and delivers ! Thanks !